1N3321A

Overview

The Microchip Technology 1N3321A is a high-power 50 W Zener diode belonging to the 1N3305 through 1N3350B series. It provides voltage regulation with a nominal Zener voltage of 24 V at a test current of 520 mA. The device features a maximum dynamic impedance of 2.6 Ohms and a maximum reverse current of 10 µA. It operates within a junction temperature range of -65°C to +175°C and utilizes a DO-5 (DO-203AB) hexagonal stud package.

Feature Summary

• Hermetically sealed welded metal and glass construction for durability
• Internal solder bond design ensuring structural integrity
• Standard polarity configuration with anode connected to the case
• Inherently radiation hard characteristics

Applications

• High power voltage regulation
• Military and aerospace electronic systems
• Harsh environment circuit protection

Procurement Notes

Verify the specific suffix requirements, as the 'A' or 'B' designation determines the voltage tolerance percentage. Confirm that the required polarity matches the standard anode-to-case configuration unless an 'R' suffix is specified. Ensure mounting hardware accommodates the 11/16 inch hexagonal stud and 1/4-28 threads for proper thermal dissipation.

Selection Notes

Select this component when applications require robust 50 W power handling capabilities in extreme temperatures. The DO-5 package facilitates direct stud mounting for efficient heat transfer. Consider the +/- 5% tolerance associated with the B suffix if tighter voltage regulation is necessary compared to standard variants.

Part Context

This part belongs to the 1N3305 through 1N3350B series of 50 Watt Zener diodes manufactured by Microsemi's Scottsdale Division. These devices are designed for high-reliability applications requiring broad voltage selection from 3.9 V to 200 V. The series supports military qualifications including JAN, JANTX, and JANTXV levels.

Replacement Considerations

Equivalent parts include the 1N4553B from the parallel 1N4549B through 1N4556B series.